This is already over. If the strike goes ahead, BA will destroy BASSA and the militant tendency - and it may well then damage the T & Cs and incomes of everyone else. If there isn't a strike, then BASSA have shot their bolt and will never again be able to challenge BA, because BA can make the same threats in future.
Long term, a strike may even be in BA's interest, oddly enough. But it certainly isn't in the crew's. Time to pull back ladies and gents, before you wreck what you have.